Based on what I've seen in the episodes, it sounded like she had somewhat of a bond with her family, but the series doesn't go into enough detail to really tell. Whiskers basically destroyed anything that would help with determining Brandy's old life. One clue is in "Pedigree Schmedigree", it turns out she's actually adopted. That's basically the only hint we get. Since in the first season, she was determined to get home, I would have to say that she did enjoy her old life.